<template>
    <div class="app-container">
      <el-form inline>
        <!-- 表单元素 -->
        <el-form-item>
           <el-input v-model="tempSearchObj.username" placeholder="用户名" />
        </el-form-item>
        <!-- 查询与情况的按钮 -->
        <el-button type="primary" icon="el-icon-search" @click="search">查询</el-button>
        <el-button type="default" @click="resetSearch">清空</el-button>
      </el-form>
  
      <div style="margin-bottom: 20px">
        <!-- 添加与批量添加按钮 -->
        <el-button type="primary" @click="showAddUser">添 加</el-button>
        <el-button type="danger" @click="revomveUsers" :disabled="selectedIds.length===0"
          >批量删除</el-button>
      </div>
  
      <!-- table表格：展示用户信息的地方 -->
      <el-table
        border
        stripe
        v-loading="listLoading"
        :data="users"
        @selection-change="handleSelectionChange">
  
        <el-table-column
          type="selection"
          width="55" />
  
        <el-table-column
          type="index"
          label="序号"
          width="80"
          align="center"
        />
  
        <el-table-column prop="username" label="用户名" width="150" />
        <el-table-column prop="nickName" label="用户昵称" />
        <el-table-column prop="roleName" label="权限列表" />
        
        <el-table-column prop="gmtCreate" label="创建时间" width="180"/>
        <el-table-column prop="gmtModified" label="更新时间" width="180"/>
  
        <el-table-column label="操作" width="230" align="center">
          <template slot-scope="{row}">
            <el-button type="info" size="mini" icon="el-icon-user-solid" title="分配角色"
              @click="showAssignRole(row)"></el-button>
            <el-button type="primary" size="mini" icon="el-icon-edit" title="修改用户"
              @click="showUpdateUser(row)"></el-button>
            <el-popconfirm :title="`确定删除 ${row.username} 吗?`" @onConfirm="removeUser(row.id)">
              <el-button style="margin-left:10px" slot="reference" type="danger" size="mini" icon="el-icon-delete" 
                title="删除用户"></el-button>
            </el-popconfirm>
          </template>
        </el-table-column>
      </el-table>
      <!-- 分页器 -->
      <el-pagination
        :current-page="page"
        :total="total"
        :page-size="limit"
        :page-sizes="[3, 10, 20, 30, 40, 50, 100]"
        style="padding: 20px 0;"
        layout="prev, pager, next, jumper, ->, sizes, total"
        @current-change="getUsers"
        @size-change="handleSizeChange"
      />
      <!-- 对话框的结构 -->
      <el-dialog :title="user.id ? '修改用户' : '添加用户'" :visible.sync="dialogUserVisible">
        <el-form ref="userForm" :model="user" :rules="userRules" label-width="120px">
          <el-form-item label="用户名" prop="username">
            <el-input v-model="user.username"/>
          </el-form-item>
          <el-form-item label="用户昵称">
            <el-input v-model="user.nickName"/>
          </el-form-item>
          
          <el-form-item v-if="!user.id" label="用户密码" prop="password">
            <el-input v-model="user.password"/>
          </el-form-item>
        </el-form>
        <div slot="footer" class="dialog-footer">
          <el-button @click="cancel">取 消</el-button>
          <el-button :loading="loading" type="primary" @click="addOrUpdate">确 定</el-button>
        </div>
      </el-dialog>
  
      <el-dialog title="设置角色" :visible.sync="dialogRoleVisible" :before-close="resetRoleData">
        <el-form label-width="80px">
          <el-form-item label="用户名">
            <el-input disabled :value="user.username"></el-input>
          </el-form-item>
  
          <el-form-item label="角色列表">
            <el-checkbox :indeterminate="isIndeterminate" v-model="checkAll" @change="handleCheckAllChange">全选</el-checkbox>
            <div style="margin: 15px 0;"></div>
            <el-checkbox-group v-model="userRoleIds" @change="handleCheckedChange">
              <el-checkbox v-for="role in allRoles" :key="role.id" :label="role.id">{{role.roleName}}</el-checkbox>
            </el-checkbox-group>
          </el-form-item>
        </el-form>
  
        <div slot="footer">
          <el-button :loading="loading" type="primary" @click="assignRole">保存</el-button>
          <el-button @click="resetRoleData">取消</el-button>
        </div>
      </el-dialog>
    </div>
  </template>
  
  <script>
  import cloneDeep from 'lodash/cloneDeep'
  
  export default {
    name: 'AclUserList',
  
    data () {
      return {
        listLoading: false, // 是否显示列表加载的提示
        searchObj: { // 包含请求搜索条件数据的对象
          username: ''
        },
        tempSearchObj: { // 收集搜索条件输入的对象
          username: ''
        },
        selectedIds: [], // 所有选择的user的id的数组
        users: [], // 当前页的用户列表
        page: 1, // 当前页码
        limit: 3, // 每页数量
        total: 0, // 总数量
        user: {}, // 当前要操作的user
        dialogUserVisible: false, // 是否显示用户添加/修改的dialog
        userRules: { // 用户添加/修改表单的校验规则
          username: [
            { required: true, message: '用户名必须输入' },
            { min: 4, message: '用户名不能小于4位' }
          ],
          password: [
            { required: true, validator: this.validatePassword }
          ]
        },
        loading: false, // 是否正在提交请求中
        dialogRoleVisible: false, // 是否显示角色Dialog
        allRoles: [], // 所有角色列表
        userRoleIds: [], // 用户的角色ID的列表
        isIndeterminate: false, // 是否是不确定的
        checkAll: false, // 是否全选
      }
    },
  
    //发请求一般情况下，我们都是在mounted去发，但是也可以在created内部去发
    created () {
      this.getUsers()
    },
  
    methods: {
      /* 
      显示指定角色的界面
      */
      showAssignRole (user) {
        this.user = user
        this.dialogRoleVisible = true
        this.getRoles()
      },
  
      /* 
      全选勾选状态发生改变的监听
      */
      handleCheckAllChange (value) {// value 当前勾选状态true/false
        // 如果当前全选, userRoleIds就是所有角色id的数组, 否则是空数组
        this.userRoleIds = value ? this.allRoles.map(item => item.id) : []
        // 如果当前不是全选也不全不选时, 指定为false
        this.isIndeterminate = false
      },
  
      /* 
      异步获取用户的角色列表
      */
      async getRoles () {
        const result = await this.$API.user.getRoles(this.user.id)
        const {allRolesList, assignRoles} = result.data
        this.allRoles = allRolesList
        this.userRoleIds = assignRoles.map(item => item.id)
        
        this.checkAll = allRolesList.length===assignRoles.length
        this.isIndeterminate = assignRoles.length>0 && assignRoles.length<allRolesList.length
      },
  
      /* 
      角色列表选中项发生改变的监听
      */
      handleCheckedChange (value) {
        const {userRoleIds, allRoles} = this
        this.checkAll = userRoleIds.length === allRoles.length && allRoles.length>0
        this.isIndeterminate = userRoleIds.length>0 && userRoleIds.length<allRoles.length
      },
  
      /* 
      请求给用户进行角色授权
      */
      async assignRole () {
        const userId = this.user.id
        const roleIds = this.userRoleIds.join(',')
        this.loading = true
        const result = await this.$API.user.assignRoles(userId, roleIds)
        this.loading = false
        this.$message.success(result.message || '分配角色成功')
        this.resetRoleData()
  
        // console.log(this.$store.getters.name, this.user)
        if (this.$store.getters.name===this.user.username) {
          window.location.reload()
        }
      },
  
      /* 
      重置用户角色的数据
      */
      resetRoleData () {
        this.dialogRoleVisible = false
        this.allRoles = []
        this.userRoleIds = []
        this.isIndeterminate = false
        this.checkAll = false
      },
  
      /* 
      自定义密码校验
      */
      validatePassword (rule, value, callback) {
        if (!value) {
          callback('密码必须输入')
        } else if (!value || value.length < 6) {
          callback('密码不能小于6位')
        } else {
          callback()
        }
      },
      /* 
      根据输入进行搜索
      */
      search () {
        this.searchObj = {...this.tempSearchObj}
        this.getUsers()
      },
  
      /* 
      重置输入后搜索
      */
      resetSearch () {
        this.searchObj = {
          username: ''
        }
        this.tempSearchObj = {
          username: ''
        }
        this.getUsers()
      },
  
      /* 
      显示添加用户的界面
      */
      showAddUser () {
        this.user = {}
        this.dialogUserVisible = true
  
        this.$nextTick(() => this.$refs.userForm.clearValidate())
      },
  
      /* 
      删除所有选中的用户
      */
      revomveUsers () {
        this.$confirm('确定删除吗?').then(async () => {
          await this.$API.user.removeUsers(this.selectedIds)
          this.$message.success('删除成功')
          this.getUsers()
        }).catch(() => {
          this.$message.info('取消删除')
        })
      },
  
      /* 
      列表选中状态发生改变的监听回调
      */
      handleSelectionChange (selection) {
        this.selectedIds = selection.map(item => item.id)
      },
  
      /* 
      显示更新用户的界面
      */
      showUpdateUser (user) {
        this.user = cloneDeep(user)
        this.dialogUserVisible = true
      },
  
      /* 
      删除某个用户
      */
      async removeUser (id) {
        await this.$API.user.removeById(id)
        this.$message.success('删除成功')
        this.getUsers(this.users.length===1 ? this.page-1 : this.page)
      },
  
      /* 
      获取分页列表
      */
      async getUsers (page=1) {
        this.page = page
        const {limit, searchObj} = this
        this.listLoading = true
        const result = await this.$API.user.getPageList(page, limit, searchObj)
        this.listLoading = false
        const {items, total} = result.data
        this.users = items.filter(item => item.username!=='admin')
        this.total = total-1
        this.selectedIds = []
      },
  
      /* 
      处理pageSize发生改变的监听回调
      */
      handleSizeChange (pageSize) {
        this.limit = pageSize
        this.getUsers()
      },
  
      /* 
      取消用户的保存或更新
      */
      cancel () {
        this.dialogUserVisible = false
        this.user = {}
      },
  
      /* 
      保存或者更新用户
      */
      addOrUpdate () {
        this.$refs.userForm.validate(valid => {
          if (valid) {
            const {user} = this
            this.loading = true
            this.$API.user[user.id ? 'update' : 'add'](user).then((result) => {
              this.loading = false
              this.$message.success('保存成功!')
              this.getUsers(user.id ? this.page : 1)
              this.user = {}
              this.dialogUserVisible = false
            })
          }
        })
      }
    }
  }
  </script>
  